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Full-Text Articles in Engineering
Small Angle X-Ray Scattering Studies Of Zinc Stearate Filled Sulfonated Epdm, D. A. Jackson, J. T. Koberstein, Robert Weiss
Small Angle X-Ray Scattering Studies Of Zinc Stearate Filled Sulfonated Epdm, D. A. Jackson, J. T. Koberstein, Robert Weiss
Robert Weiss
The crystallization, melting, and dissolution behavior of zinc stearate (ZnSt) in ZnSt-filled sulfonated poly(ethylene-co-propylene-co-ethylidene norbornene) (SEPDM) ionomers was studied by synchrotron small-angle X-ray scattering (SAXS). The melting temperature of ZnSt in the ionomer was considerably lower than in the pure state, which was consistent with the existence of very small ZnSt crystalline domains and a specific interaction between the metal sulfonate groups of the SEPDM and the metal carboxylate groups of ZnSt. Temperature-resolved SAXS showed that, on melting, some or all of the ZnSt rapidly dissolved into the ionomer. Ionic aggregates in the neat ionomer persisted up to 300°C. Microphase …
Small Angle X-Ray Scattering Studies Of Zinc Stearate-Filled Sulfonated Epdm Ionomers, D. A. Jackson, J. T. Koberstein, Robert Weiss
Small Angle X-Ray Scattering Studies Of Zinc Stearate-Filled Sulfonated Epdm Ionomers, D. A. Jackson, J. T. Koberstein, Robert Weiss
Robert Weiss
The crystallization, melting, and dissolution behavior of zinc stearate (ZnSt) in ZnSt-filled sulfonated poly(ethylene-co-propylene-co-ethylidene norbornene) (SEPDM) ionomers was studied by synchrotron small-angle X-ray scattering (SAXS). The melting temperature of ZnSt in the ionomer was considerably lower than in the pure state, which was consistent with the existence of very small ZnSt crystalline domains and a specific interaction between the metal sulfonate groups of the SEPDM and the metal carboxylate groups of ZnSt. Temperature-resolved SAXS showed that, on melting, some or all of the ZnSt rapidly dissolved into the ionomer. Ionic aggregates in the neat ionomer persisted up to 300°C. Microphase …
Solution Viscosity Behavior Of Complexes Of Poly(Γ-Benzyl-L-Glutamate) With Lightly Sulfonated Polystyrene Or Its Zinc Salt, L. Shao, Robert Weiss, R. D. Lundberg
Solution Viscosity Behavior Of Complexes Of Poly(Γ-Benzyl-L-Glutamate) With Lightly Sulfonated Polystyrene Or Its Zinc Salt, L. Shao, Robert Weiss, R. D. Lundberg
Robert Weiss
The rheological behavior of solutions containing blends of poly(γ-benzyl-l-glutamate) (PBLG) and either the free acid or the zinc salt of lightly sulfonated polystyrene (SPS) was studied as a function of blend composition, polymer concentration, degree of sulfonation of the SPS, and the polypeptide molecular weight. The zinc salt of SPS formed a transition metal complex with the amine-end groups of the PBLG, and this resulted in an enhancement of the solution viscosity relative to a weighted average of the viscosities of the individual polymer solutions. The ZnSPS/PBLG solutions showed no anomalous time or shear dependencies. In contrast, solutions containing PBLG …
Synthesis And Polymerization Of Substituted Ammonium Sulfonate Monomers For Advanced Materials Applications, Kevin Cavicchi
Synthesis And Polymerization Of Substituted Ammonium Sulfonate Monomers For Advanced Materials Applications, Kevin Cavicchi
Kevin Cavicchi
Sulfonated polymers have found use as ion-exchange membranes for use in fuel cells, water purification, electroactive devices, and inorganic materials templating and synthesis. Improving the materials for these applications and opening up new applications requires the ability to synthesis targeted or more complex sulfonated polymers, which includes tailoring the chemistry (copolymerization across a wider range of solubility) and/or polymer architecture (block, graft, nanoparticle). This article will summarize the recent work using sulfonated monomers with substituted ammonium counterions as a versatile route for enabling this goal. Two main benefits of these monomers are as follows. First, they are useful for preparing …
Synthesis And Properties Of Carboxylated Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Its Ionomer, William Macknight, Yuhui Huang, Guangmin Cong
Synthesis And Properties Of Carboxylated Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Its Ionomer, William Macknight, Yuhui Huang, Guangmin Cong
William MacKnight
No abstract provided.
Infrared Studies Of Hydrogen Bonding In Ethylene-Methacrylic Acid Copolymers And Ionomers, William Macknight, T. R. Earnest Jr.
Infrared Studies Of Hydrogen Bonding In Ethylene-Methacrylic Acid Copolymers And Ionomers, William Macknight, T. R. Earnest Jr.
William MacKnight
No abstract provided.